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The effects of TiO2 in the glasses on the shrinkage and dielectric properties of BNT-glass composites have been investigated. Without TiO2 addition, BNT-glass composite showed two humps in the shrinkage curve, which are related with crystallization of BaTi(BO3)2 and Bi4Ti3O12. However, the increase of TiO2 addition resulted in the decrease of 2nd hump in the shrinkage. The increased dielectric constant with TiO2 addition might be due to the reduced crystallization of Bi4Ti3O12. A dielectric constant of 52, a quality factor of 5088 GHz, and a temperature coefficient of resonant frequency of −0.16 ppm/oC were obtained for a specimen containing TiO2-added glasses, without sacrificing the benefits of high εr and low TCF of BNT ceramics.